Description

Enable require_secure_transport on MySQL flexible servers.

Rationale

SSL connectivity provides an additional layer of security by connecting the database server to client applications using Secure Sockets Layer (SSL). Enforcing SSL connections between the database server and client applications helps protect against "man in the middle" attacks by encrypting the data stream between the server and application.

Audit

From Azure Portal

1. Log in to Azure Portal using https://portal.azure.com.
2. Go to Azure Database for MySQL flexible servers.
3. For each database, under Settings, click Server parameters.
4. In the filter bar, type require_secure_transport.
5. Ensure that the VALUE for require_secure_transport is ON.

From Azure CLI

Ensure the following command returns a value of on:

az mysql flexible-server parameter show \
    --resource-group {{resource-group-name}} \
    --server-name {{server-name}} \
    --name require_secure_transport

From PowerShell

Ensure the following command returns a value of on:

Get-AzMySqlFlexibleServerConfiguration `
    -ResourceGroupName {{resource-group-name}} `
    -ServerName {{server-name}} `
    -Name require_secure_transport

Default Value

Azure Database for MySQL when provisioned through the Azure portal or CLI will require SSL connections by default.

References

1. https://learn.microsoft.com/en-us/azure/mysql/flexible-server/concepts-networking#tls-and-ssl
2. https://learn.microsoft.com/en-us/security/benchmark/azure/mcsb-data-protection#dp-3-encrypt-sensitive-data-in-transit